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LMP8646

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-2 to 76V, configurable gain and bandwidth, high-speed current limiter

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Data sheet

LMP8646

ACTIVE
Data sheet Order now

Product details

Product type Analog output Common-mode voltage (max) (V) 76 Common-mode voltage (min) (V) -2 Input offset (±) (max) (µV) 1000 Input offset drift (±) (typ) (µV/°C) 4 Features Low-side Capable, Programmable Gain Rating Catalog Voltage gain (V/V) adjustable CMRR (min) (dB) 55 Bandwidth (kHz) 35 Supply voltage (max) (V) 12 Supply voltage (min) (V) 2.7 Iq (max) (mA) 3.11 Number of channels 1 Comparators (#) 0 Gain error (%) 2 Gain error drift (±) (max) (ppm/°C) 140 Slew rate (V/µs) 0.5 Operating temperature range (°C) -40 to 125
Product type Analog output Common-mode voltage (max) (V) 76 Common-mode voltage (min) (V) -2 Input offset (±) (max) (µV) 1000 Input offset drift (±) (typ) (µV/°C) 4 Features Low-side Capable, Programmable Gain Rating Catalog Voltage gain (V/V) adjustable CMRR (min) (dB) 55 Bandwidth (kHz) 35 Supply voltage (max) (V) 12 Supply voltage (min) (V) 2.7 Iq (max) (mA) 3.11 Number of channels 1 Comparators (#) 0 Gain error (%) 2 Gain error drift (±) (max) (ppm/°C) 140 Slew rate (V/µs) 0.5 Operating temperature range (°C) -40 to 125
SOT-23-THN (DDC) 6 8.12 mm² 2.9 x 2.8
  • Provides Circuit Protection and Current Limiting
  • Single Supply Operation
  • –2-V to 76-V Common-Mode Voltage Range
  • Variable Gain Set by External Resistor
  • Adjustable Bandwidth Set by External Capacitor
  • Buffered Output
  • 3% Output Accuracy Achievable at VSENSE = 100 mV
  • Key Specifications:
    • Supply Voltage Range 2.7 V to 12 V
    • Output Current (Source) 0 to 5 mA
    • Gain Accuracy 2.0% (max)
    • Transconductance 200 µA/V
    • Offset ±1 mV (Maximum)
    • Quiescent Current 380 µA
    • Input Bias 12 µA (Typical)
    • PSRR 85 dB
    • CMRR 95 dB
    • Temperature Range −40°C to 125°C
    • 6-Pin SOT Package
  • Provides Circuit Protection and Current Limiting
  • Single Supply Operation
  • –2-V to 76-V Common-Mode Voltage Range
  • Variable Gain Set by External Resistor
  • Adjustable Bandwidth Set by External Capacitor
  • Buffered Output
  • 3% Output Accuracy Achievable at VSENSE = 100 mV
  • Key Specifications:
    • Supply Voltage Range 2.7 V to 12 V
    • Output Current (Source) 0 to 5 mA
    • Gain Accuracy 2.0% (max)
    • Transconductance 200 µA/V
    • Offset ±1 mV (Maximum)
    • Quiescent Current 380 µA
    • Input Bias 12 µA (Typical)
    • PSRR 85 dB
    • CMRR 95 dB
    • Temperature Range −40°C to 125°C
    • 6-Pin SOT Package

The LMP8646 is a precision current limiter used to improve the current limit accuracy of any switching or linear regulator with an available feedback node.

The LMP8646 accepts input signals with a common-mode voltage ranging from –2 V to 76 V. It has a variable gain which is used to adjust the sense current. The gain is configured with a single external resistor, RG, providing a high level of flexibility and accuracy up to 2%. The adjustable bandwidth, which allows the device to be used with a variety of applications, is configurable with a single external capacitor in parallel with RG. In addition, the output is buffered in order to provide a low output impedance.

The LMP8646 is an ideal choice for industrial, automotive, telecommunications, and consumer applications where circuit protection and improved precision systems are required. The LMP8646 is available in a 6-pin SOT package and can operate at temperature range of −40°C to 125°C.

The LMP8646 is a precision current limiter used to improve the current limit accuracy of any switching or linear regulator with an available feedback node.

The LMP8646 accepts input signals with a common-mode voltage ranging from –2 V to 76 V. It has a variable gain which is used to adjust the sense current. The gain is configured with a single external resistor, RG, providing a high level of flexibility and accuracy up to 2%. The adjustable bandwidth, which allows the device to be used with a variety of applications, is configurable with a single external capacitor in parallel with RG. In addition, the output is buffered in order to provide a low output impedance.

The LMP8646 is an ideal choice for industrial, automotive, telecommunications, and consumer applications where circuit protection and improved precision systems are required. The LMP8646 is available in a 6-pin SOT package and can operate at temperature range of −40°C to 125°C.
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Technical documentation

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Type Title Date
* Data sheet LMP8646 Precision Current Limiter datasheet (Rev. B) PDF | HTML 08 Dec 2014
Application note Using a PCB Copper Trace as a Current-Sense Shunt Resistor PDF | HTML 25 Jan 2022
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Application brief Precision LED Brightness and Color Mixing With Discrete Current Sense Amplifiers 28 Feb 2017
Application note AN-2219 Precision Current Limiting with the LMP8646 and LP38501 (Rev. A) 24 Apr 2013
Application note AN-2200 Precision Current Limiting with the LMP8646 and LMZ12003 (Rev. A) 23 Apr 2013
Application note AN-2218 Precision Current Limiting with the LMP8646 and LM3102 (Rev. A) 23 Apr 2013
User guide LMP8646EB User's Guide 13 Feb 2012

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

LMP8646EB — LMP8646 Evaluation Board

The LMP8646 Evaluation Board (LMP8646EB) is designed to ease evaluation and design-in of TI's LMP8646, a Precision Current Limiter. The LMP8646 is used to detect small differential voltages across a sense resistor in the presence of high input common mode voltages. On board with the current (...)

User guide: PDF
Not available on TI.com
Evaluation board

TPS63802HDKEVM — TPS63802HDKEVM - Hardware Development Kit

The TPS63802HDKEVM is a universal development tool designed to help the users easily and quickly evaluate and test the most common buck-boost converter use-cases. The use-cases include backup power, input current limit, LED driver, digital voltage scaling, bypass mode and precise enable. The user (...)

User guide: PDF
Not available on TI.com
Simulation model

LMP8646 PSpice Model

SNOM308.ZIP (15 KB) - PSpice Model
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Simulation model

LMP8646 TINA-TI Reference Design

SNOM319.TSC (37 KB) - TINA-TI Reference Design
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Simulation model

LMP8646 TINA-TI Spice Model

SNOM320.ZIP (4 KB) - TINA-TI Spice Model
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Calculation tool

CS-AMPLIFIER-ERROR-TOOL — Current Sense Amplifier Comparison and Error Tool

This Excel calculator provides a comparison between two and five of our standard current sense amplifiers, delivering a chart containing the basic parameters of each device. This calculator also takes system condition inputs from users such as common-mode voltage, supply voltage, shunt resistor (...)
Supported products & hardware

Supported products & hardware

Products
Analog current-sense amplifiers
  • INA138 — 2.7 to 36V, 800kHz Variable gain current sense amplifier
  • INA138-Q1 — AEC-Q100, 2.7 to 36V, 800kHz Variable gain current sense amplifier
  • INA139 — 2.7 to 36V, 440kHz Variable gain current sense amplifier
  • INA139-Q1 — AEC-Q100, 2.7 to 36V, 440kHz Variable gain current sense amplifier
  • INA168 — 2.7 to 60V, 800kHz Variable gain current sense amplifier
  • INA168-Q1 — AEC-Q100, 2.7 to 60V, 800kHz Variable gain current sense amplifier
  • INA169 — 2.7 to 60V, 440kHz Variable gain current sense amplifier
  • INA169-Q1 — AEC-Q100, 2.7 to 60V, 440kHz Variable gain current sense amplifier
  • INA170 — 2.7 to 60V, bi-directional, 400kHz Variable gain current sense amplifier
  • INA180 — 26V, 350kHz current sense amplifier
  • INA180-Q1 — AEC-Q100, 26V, 350kHz current sense amplifier
  • INA181 — 26-V bi-directional 350-kHz current-sense amplifier
  • INA181-Q1 — AEC-Q100, 26V, bi-directional, 350kHz current sense amplifier
  • INA183 — 2.7-V to 26-V, high-precision current sense amplifier with input supply
  • INA185 — 26-V, 350-kHz, bi-directional, high-precision current sense amplifier in ultra-small SOT-563 package
  • INA186 — 40-V, bidirectional, high-precision current sense amplifier with picoamp input bias & ENABLE
  • INA186-Q1 — AEC-Q100, 40-V, bidirectional, high-precision current sense amplifier w/ picoamp input bias & ENABLE
  • INA190 — 40-V, bidirectional, ultraprecise current sense amplifier with picoamp IB & ENABLE
  • INA190-Q1 — AEC-Q100, 40V, bi-directional, ultra-precise current sense amplifier w/picoamp IB & ENABLE
  • INA191 — 40V, ultra-precise current sense amplifier with ENABLE and picoamp IB in WCSP
  • INA193 — -16 to 80V, 500kHz current sense amplifier
  • INA193A-EP — Enhanced product, -16 to 80V, 500-kHz current sense amplifier
  • INA193A-Q1 — AEC-Q100, -16 to 80V, 500kHz current sense amplifier
  • INA194 — -16 to 80V, 500kHz current sense amplifier
  • INA194A-Q1 — AEC-Q100, -16 to 80V, 500kHz current sense amplifier
  • INA195 — -16 to 80V, 500kHz current sense amplifier
  • INA195A-Q1 — AEC-Q100, -16 to 80V, 500kHz current sense amplifier
  • INA196 — -16 to 80V, 500kHz current sense amplifier
  • INA196A-Q1 — AEC-Q100, -16 to 80V, 500kHz current sense amplifier
  • INA197 — -16 to 80V, 500kHz current sense amplifier
  • INA197A-Q1 — AEC-Q100, -16 to 80V, 500kHz current sense amplifier
  • INA198 — -16 to 80V, 500kHz current sense amplifier
  • INA198A-Q1 — AEC-Q100, -16 to 80V, 500kHz current sense amplifier
  • INA199 — 26V, bi-directional current sense amplifier
  • INA199-Q1 — AEC-Q100, 26V, bi-directional current sense amplifier
  • INA200 — -16 to 80V, 500kHz current sense amplifier w/ comparator
  • INA200-Q1 — AEC-Q100, -16 to 80V, 500kHz current sense amplifier w/ comparator
  • INA201 — -16 to 80V, 500kHz current sense amplifier w/ comparator
  • INA201-Q1 — AEC-Q100, -16 to 80V, 500kHz current sense amplifier w/ comparator
  • INA202 — -16 to 80V, 500kHz current sense amplifier w/ comparator
  • INA202-Q1 — AEC-Q100, -16 to 80V, 500kHz current sense amplifier w/ comparator
  • INA203 — -16 to 80V, 500kHz current sense amplifier w/ dual comparators
  • INA203-Q1 — AEC-Q100, -16 to 80V, 500kHz current sense amplifier w/ dual comparators
  • INA204 — -16 to 80V, 500kHz current sense amplifier w/ dual comparators
  • INA205 — -16 to 80V, 500kHz current sense amplifier w/ dual comparators
  • INA206 — -16 to 80V, 500kHz current sense amplifier w/ window comparator
  • INA207 — -16 to 80V, 500kHz current sense amplifier w/ window comparator
  • INA208 — -16 to 80V, 500kHz current sense amplifier w/ window comparator
  • INA210 — 26V, bi-directional, high-precision current sense amplifier
  • INA210-Q1 — AEC-Q100, 26V, bi-directional, high-precision current sense amplifier
  • INA211 — 26V, bi-directional, high-precision current sense amplifier
  • INA211-Q1 — AEC-Q100, 26V, bi-directional, high-precision current sense amplifier
  • INA212 — 26V, bi-directional, high-precision current sense amplifier
  • INA212-Q1 — AEC-Q100, 26V, bi-directional, high-precision current sense amplifier
  • INA213 — 26V, bi-directional, high-precision current sense amplifier
  • INA213-Q1 — AEC-Q100, 26V, bi-directional, high-precision current sense amplifier
  • INA214 — 26V, bi-directional, high-precision current sense amplifier
  • INA214-Q1 — AEC-Q100, 26V, bi-directional, high-precision current sense amplifier
  • INA215 — 26V, bi-directional, high-precision current sense amplifier
  • INA215-Q1 — AEC-Q100, 26V, bi-directional, high-precision current sense amplifier
  • INA216 — 1.8 to 5.5V, high-precision current sense amplifier in wcsp
  • INA2180 — 26V, dual channel, 350kHz current sense amplifier
  • INA2180-Q1 — AEC-Q100, 26V, dual channel, 350kHz current sense amplifier
  • INA2181 — 26V, dual channel, bi-directional, 350kHz current sense amplifier
  • INA2181-Q1 — AEC-Q100, 26V, dual channel, bi-directional, 350kHz current sense amplifier
  • INA2191 — 40-V, dual-channel, bidirectional, ultraprecise current sense amp w/ picoamp IB & ENABLE in wcsp
  • INA223 — 26V, programmable-gain current sense amplifier & analog power monitor
  • INA225 — 36V, bi-directional current sense amplifier w/ four pin-selectable gain settings
  • INA225-Q1 — AEC-Q100, 36V, bi-directional current sense amplifier w/ four pin-selectable gain settings
  • INA2290 — Dual-channel, 2.7-V to 120-V, 1.1-MHz, ultra-precise current sense amplifier
  • INA240 — -4 to 80V, bidirectional, ultra-precise current sense amplifier with enhanced PWM rejection
  • INA240-Q1 — AEC-Q100, -4 to 80V, bi-directional, ultra-precise current sense amplifier w/ enhanced pwm rejection
  • INA241A — -5-V to 110-V bidirectional ultraprecise current sense amplifier with enhanced PWM rejection
  • INA241A-Q1 — AEC-Q100, -4V to 110V bidirectional ultraprecise current sense amplifier with enhanced PWM rejection
  • INA241B — -5-V to 110-V bidirectional high-precision current sense amplifier with enhanced PWM rejection
  • INA241B-Q1 — AEC-Q100, -4V to 110V bidirectional high-precision current sense amp with enhanced PWM rejection
  • INA270 — -16 to 80V, split-stage current sense amplifier w/ in-line filter capability
  • INA270A-Q1 — AEC-Q100, -16 to 80V, split-stage current sense amplifier w/ in-line filter capability
  • INA271 — -16 to 80V, split-stage current sense amplifier w/ in-line filter capability
  • INA271-HT — High temp, -16 to 80V, split-stage current sense amplifier w/ in-line filter capability
  • INA271A-Q1 — AEC-Q100, -16 to 80V, split-stage current sense amplifier w/ in-line filter capability
  • INA280 — 2.7-V to 120-V, 1.1-MHz, high-precision current sense amplifier in small (SC-70) package
  • INA280-Q1 — AEC-Q100, 2.7-V to 120-V, 1.1-Mhz current sense amplifier in small (SC-70) package
  • INA281 — -4-V to 110-V, 1.3-MHz, high-precision current sense amplifier
  • INA281-Q1 — AEC-Q100, -4-V to 110-V, 1.3-MHz current sense amplifier
  • INA282 — -14 to 80V, bi-directional current sense amplifier
  • INA282-Q1 — AEC-Q100, -14 to 80V, bi-directional current sense amplifier
  • INA283 — -14 to 80V, bi-directional current sense amplifier
  • INA283-Q1 — AEC-Q100, -14 to 80V, bi-directional current sense amplifier
  • INA284 — -14 to 80V, bi-directional current sense amplifier
  • INA284-Q1 — AEC-Q100, -14 to 80V, bi-directional current sense amplifier
  • INA285 — -14 to 80V, bi-directional current sense amplifier
  • INA285-Q1 — AEC-Q100, -14 to 80V, bi-directional current sense amplifier
  • INA286 — -14 to 80V, bi-directional current sense amplifier
  • INA286-Q1 — AEC-Q100, -14 to 80V, bi-directional current sense amplifier
  • INA290 — 2.7 to 120V, 1.1MHz, ultra-precise current sense amplifier in small (SC-70) package
  • INA290-Q1 — AEC-Q100, 2.7-V to 120-V, 1.1-MHz, ultra-precise current sense amplifier in small (SC-70) package
  • INA293 — -4-V to 110-V, 1.3-MHz, ultra-precise current sense amplifier
  • INA293-Q1 — AEC-Q100, -4-V to 110-V, 1.3-MHz, ultra-precise current sense amplifier
  • INA296A — -5-V to 110-V, bidirectional, 1.1-MHz 8-V/µs ultraprecise current sense amplifier
  • INA296A-Q1 — AEC-Q100, -5V to 110V, bidirectional, 1.1-MHz 8-V/µs ultraprecise current sense amplifier
  • INA296B — -5-V to 110-V, bidirectional, 1.1-MHz 8-V/µs high-precision current sense amplifier
  • INA296B-Q1 — AEC-Q100, -5V to 110V, bidirectional, 1.1-MHz 8-V/µs high-precision current sense amplifier
  • INA300 — 36V current sense comparator
  • INA300-Q1 — AEC-Q100, 36V current sense comparator
  • INA301 — 36V, 550kHz, 4V/µs, high-precision current sense amplifier w/ comparator
  • INA301-Q1 — AEC-Q100, 36V, 550kHz, 4V/µs, high-precision current sense amplifier w/ comparator
  • INA302 — 36V, bi-directional, 550kHz, 4V/µs, high-precision current sense amplifier w/ dual comparators
  • INA302-Q1 — AEC-Q100, 36V, bi-directional, 550kHz, 4V/µs, high-precision current sense amp w/ dual comparators
  • INA303 — 36V, bi-directional, 550kHz, 4V/µs, high-precision current sense amplifier w/ window comparator
  • INA303-Q1 — AEC-Q100, 36V, bi-directional, 550kHz, 4V/µs, high-precision current sense amp w/ window comparator
  • INA381 — 26-V, 350-kHz current sense amplifier with integrated over-current comparator
  • INA381-Q1 — AEC-Q100, 26-V, 350-kHz current sense amplifier with integrated overcurrent comparator
  • INA4180 — 26V, quad channel, 350kHz current sense amplifier
  • INA4180-Q1 — AEC-Q100, 26V, quad channel, 350kHz current sense amplifier
  • INA4181 — 26V, quad channel, bi-directional, 350kHz current sense amplifier
  • INA4181-Q1 — AEC-Q100, 26V, quad channel, bi-directional, 350kHz current sense amplifier
  • INA4290 — Quad-channel, 120-V, high-voltage, high-bandwidth, unidirectional current sense amplifier
  • INA901-SP — Radiation hardened, -15-V to 65-V, split-stage current sense amplifier with in-line filter option
  • LMP8278Q-Q1 — AEC-Q100, -2 to 40V, split-stage current sense amplifier w/ in-line filter capability
  • LMP8480 — 4 to 76V current sense amplifier
  • LMP8480-Q1 — AEC-Q100, 4 to 76V current sense amplifier
  • LMP8481 — 4 to 76V, bi-directional current sense amplifier
  • LMP8481-Q1 — AEC-Q100, 4 to 76V, bi-directional current sense amplifier
  • LMP8601 — -22 to 60V, bi-directional current sense amplifier w/ in-line filter capability
  • LMP8601-Q1 — AEC-Q100, -22 to 60V, bi-directional current sense amplifier w/ in-line filter capability
  • LMP8602 — -22 to 60V, bi-directional current sense amplifier w/ in-line filter capability
  • LMP8602-Q1 — AEC-Q100, -22 to 60V, bi-directional current sense amplifier w/ in-line filter capability
  • LMP8603 — -22 to 60V, bi-directional current sense amplifier w/ in-line filter capability
  • LMP8603-Q1 — AEC-Q100, -22 to 60V, bi-directional current sense amplifier w/ in-line filter capability
  • LMP8640 — -2 to 42V, 950kHz current sense amplifier
  • LMP8640-Q1 — AEC-Q100, -2 to 42V, 950kHz current sense amplifier
  • LMP8640HV — -2 to 76V, 950kHz current sense amplifier
  • LMP8645 — -2 to 42V, 990kHz, configurable gain current sense amplifier
  • LMP8645HV — -2 to 76V, 990kHz, configurable gain current sense amplifier
  • LMP8646 — -2 to 76V, configurable gain and bandwidth, high-speed current limiter
Analog current-sense amplifiers with integrated shunt resistor
  • INA250 — 36V, bi-directional, precision current sense amplifier w/int. shunt resistor
  • INA250-Q1 — AEC-Q100, 36V, bi-directional, precision current sense amplifier w/int. shunt resistor
  • INA253 — 80V, bi-directional, precision current sense amp w/pwm rejection & int. shunt resistor
  • INA253-Q1 — AEC-Q100, 80V, bi-directional, precision current sense amp w/pwm rejection & int. shunt resistor
Digital power monitors
  • INA209 — 26V, 12-bit, i2c output current/voltage/power monitor w/ analog comparator
  • INA219 — 26-V 12-bit I2C output digital power monitor
  • INA220 — 26V, 12-bit, i2c output current/voltage/power monitor
  • INA220-Q1 — AEC-Q100, 26V, 12-bit, i2c output current/voltage/power monitor
  • INA226 — 36V, 16-bit, ultra-precise i2c output current/voltage/power monitor w/alert
  • INA226-Q1 — AEC-Q100, 36V, 16-bit, ultra-precise, i2c output current/voltage/power monitor w/alert
  • INA228 — 85V, 20-bit I²C-output E3-driver-capable current, voltage, power, energy, charge monitor with alert
  • INA228-Q1 — AEC-Q100, 85-V, 20-bit, ultraprecise, I²C output current/voltage/power/energy/charge monitor
  • INA229 — 85-V, 20-bit, ultra-precise, SPI output current/voltage/power/energy/charge monitor with alert
  • INA229-Q1 — AEC-Q100, 85-V, 20-bit, ultraprecise, SPI output current/voltage/power/energy/charge monitor
  • INA230 — 36-V, 16-bit, I²C output current, voltage and power monitor with alert
  • INA231 — 28V, 16-bit, i2c output current/voltage/power monitor w/alert in wcsp
  • INA233 — 36V, 16-bit, ultra-precise i2c & pmbus output current/voltage/power/energy monitor w/alert
  • INA234 — 28-V, 12-bit, I²C output current/voltage/power monitor with alert in WCSP
  • INA236 — 48-V, 16-bit ultraprecise I²C output digital power monitor with alert in WCSP
  • INA237 — 85-V, 16-bit, I2C output current/voltage/power monitor with alert
  • INA237-Q1 — AEC-Q100, 85-V, 16-bit, I²C output current/voltage/charge monitor
  • INA238 — 85-V, 16-bit, high-precision I2C output current/voltage/power monitor with alert
  • INA238-Q1 — AEC-Q100, 85-V, 16-bit, high-precision, I²C output current/voltage/charge monitor
  • INA239 — 85-V, 16-bit, high-precision, SPI output current/voltage/power monitor with alert
  • INA239-Q1 — AEC-Q100, 85-V, 16-bit, high-precision, SPI output current/voltage/power monitor
  • INA3221 — 26V, triple channel, 13-bit, i2c output current/voltage monitor w/alerts
  • INA3221-Q1 — AEC-Q100, 26V, triple channel, 13-bit, i2c output current/voltage monitor w/alerts
  • LMP92064 — 2V, 12-bit, fast simultaneous sampling SPI output current/voltage monitor
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Design tool

CIRCUIT060035 — Bidirectional current sensing with a window comparator circuit

This bidirectional current sensing solution uses a current-sense amplifier and a high-speed dual comparator with a rail-to-rail input common mode range to create over-current (OC) alert signals at the comparator outputs (OUTA and OUTB) if the input current (IG1) rises above 100 A or falls below (...)
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Design tool

CIRCUIT060037 — Precision over-current latch circuit

This high-side, current sensing solution uses a current sense amplifier, a comparator with an integrated reference and a P-channel MOSFET to create an over-current latch circuit. When a load current greater than 200 mA is detected, the circuit disconnects the system from its power source. The (...)
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Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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Simulation tool

TINA-TI — SPICE-based analog simulation program

TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
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